<!--
 * @Description: react
 * @Author: charles
 * @Date: 2021-11-08 16:13:26
 * @LastEditors: charles
 * @LastEditTime: 2021-11-08 16:42:00
-->
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>react状态管理</title>
  <script src="https://cdn.bootcdn.net/ajax/libs/react/17.0.2/umd/react.production.min.js"></script>
  <script src="https://cdn.bootcdn.net/ajax/libs/react-dom/17.0.2/umd/react-dom.production.min.js"></script>
  <script src="https://cdn.bootcss.com/babel-standalone/6.26.0/babel.min.js"></script>
</head>
<body>
  <div id="app"></div>
  <script type="text/babel">
    // 组件
    class App extends React.Component {
      constructor(props){
        super(props);
        this.state = {
          num:1,
          obj:{
            name:"你好",
            age:12
          }
        }
      }
      componentDidMount(){
        setInterval(() => {
          this.setState({
            num:++this.state.num
          })
        }, 1000);

        setTimeout(() => {
          this.setState({
            obj:{
              ...this.state.obj,
              name:'hello'
            }
          })
        }, 3000);
      }
      render(){
        return(
          <div>
            <div> 数字{this.state.num}</div>
            <div> 名字: {this.state.obj.name}</div>
          </div>
        ) 
      }
    }
    // 渲染
    ReactDOM.render(<App/>,document.getElementById('app'))


  </script>
</body>
</html>
